Air cooler



FIG. 1 is a front elevational view of the air cooler;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left-side elevational view thereof;

FIG. 4 is a right-side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a partial-enlarged view of a part of FIG. 5, enclosed by broken line 7, as seen in FIG. 5;

FIG. 8 is a partial-enlarged view of a part of FIG. 6, enclosed by broken line 8, as seen in FIG. 6;

FIG. 9 is a first perspective view of the air cooler;

FIG. 10 is a second perspective view of the air cooler; and,

FIG. 11 is a reference view of the air cooler showing a using state.

The broken lines seen in FIGS. 5-8 represent locations and borders for enlarged views and form no part of the claimed design.

The broken lines seen in FIG. 11 are for the purpose of showing environmental structure and form no part of the claimed design. 

CLAIM The ornamental design for an air cooler, as shown and described. 